A spindle with airtightness detection function and a method for detecting the airtightness thereof

Abstract

The present invention discloses a spindle with an airtight detection function and a method for detecting its airtightness. A spindle with an airtight detection function comprises a body, and an oil cylinder and an air cylinder are arranged on the side of the body away from the tool; a broaching device is arranged inside the rotor shaft, and the broaching device comprises a broaching rod, a mandrel, a pulling claw and a reset spring for clamping the tool, and a movable pad. The pulling claw adopts an HSKA63 pulling claw, and a sealing ring is fixedly provided at one end of the mandrel close to the tool. There are multiple sealing rings, and the multiple sealing rings are arranged in a stepped manner along the axial direction of the mandrel; there are multiple reset springs, and the rotation directions of the multiple reset springs are arranged alternately in positive and negative directions. When the reset spring is in a natural state, the pulling claw clamps the tool. The present invention discloses a spindle with an airtight detection function and a method for detecting its airtightness, which can detect the sealing between the tool handle and the spindle, ensure the clamping of the tool, and ensure the grinding accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of grinding machine tools, and in particular to a spindle with an airtightness detection function and a method for detecting the airtightness of the spindle. Background Art

[0002] The electric spindle is a new technology that integrates the machine tool spindle and the spindle motor in the field of CNC machine tools. The electric spindle is an important unit that directly drives the tool to rotate and realizes the cutting and grinding of workpieces.

[0003] When the traditional electric spindle is connected to the tool holder, there may be a gap or installation error between the tool holder and the electric spindle, resulting in the inability of the pull claw to clamp the tool holder. If it is not discovered and adjusted in time, the tool is prone to vibration, ripples, and taper during cutting, which in turn affects the grinding accuracy of the workpiece. Summary of the invention

[0004] The invention discloses a main shaft with an airtightness detection function and a method for detecting the airtightness thereof, so as to detect the airtightness between a tool handle and the main shaft, ensure the clamping of the tool, and ensure the grinding accuracy.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A spindle with an airtight detection function comprises a body, wherein a stator, a rotor and a rotor shaft are arranged inside the body, an oil cylinder and an air cylinder are arranged on a side of the body away from a tool, wherein the oil cylinder comprises a first cylinder body and a first piston, and the air cylinder comprises a second cylinder body and a second piston, and when oil is injected into the first cylinder body or the second piston is driven to move, the first piston can move telescopically along its axial direction;

[0007] A broaching device is arranged inside the rotor shaft, and the broaching device comprises a broaching rod, a mandrel, a broaching claw and a reset spring for clamping the tool, and a movable pad. The broaching claw adopts an HSKA63 broaching claw, and the movable pad and the mandrel are fixedly connected to the broaching rod. The first piston and the broaching rod are provided with mutually connected air passages. When the first piston moves toward the side close to the tool, the first piston can push the broaching rod to move synchronously.

[0008] A sealing ring is fixedly arranged at one end of the mandrel close to the cutter, and the sealing rings are multiple and arranged in a stepped manner along the axial direction of the mandrel;

[0009] There are multiple return springs, and the rotation directions of the multiple return springs are arranged alternately in positive and negative directions. When the return spring is in a natural state, the pulling claw clamps the tool.

[0010] Furthermore, a piston rod is fixedly provided on the first piston, the second piston is sleeved on the outside of the piston rod, and an air intake passage communicating with the airway is opened on the piston rod.

[0011] Furthermore, a knife disc is fixedly arranged on the broaching rod, a slot is provided on the knife disc for inserting the end of the first piston, the end of the broaching rod extends into the slot, a clearance groove is provided on the first piston for inserting the end of the broaching rod, and a sealing ring is arranged between the first piston and the slot;

[0012] When the first piston is inserted into the slot, the tool pull rod is inserted into the clearance groove, and a space is reserved between the end of the tool pull rod and the bottom wall of the clearance groove.

[0013] Based on a spindle with an airtightness detection function, a method for detecting the airtightness of the spindle in a broaching state includes the following steps:

[0014] S1: A mandrel is manufactured according to the specifications of the HSKA63 claw and adapted thereto. The outer diameter of the mandrel is smaller than the inner diameter of the claw. One end of the mandrel is set as a large head end. A sealing ring is embedded in the large head end of the mandrel. The outer diameters of the multiple sealing rings gradually decrease along the axial direction of the mandrel.

[0015] A connecting groove is provided at the end of the rotor shaft, and the aperture of the connecting groove gradually decreases along the axial direction;

[0016] S2: Install the oil cylinder, air cylinder and machine body together, start the oil cylinder to push the tool pull rod, push out the big end of the mandrel, then insert the end of the tool into the connecting groove, drive the oil cylinder in the reverse direction, and the tool pull rod returns to its original position under the action of the reset spring. At this time, the big end of the mandrel can drive the claw to expand outward so that the tool is limited between the inner wall of the connecting groove and the end of the claw;

[0017] S3: Connect the pipe joint, pressure switch and alarm to the airway. The pressure switch and alarm are electrically connected.

[0018] S4: In the broaching state, 0.5Mpa air pressure is introduced into the airway. If the pressure value detected by the pressure switch is less than 0.3Mpa within 10 minutes, the alarm will sound an alarm, and it can be determined that the air tightness of the connection between the spindle and the tool is unqualified.

[0019] Furthermore, a plug-in portion is extended from the end of the cutter, and the plug-in portion is plugged into the interior of the large end of the core shaft, and the stepped sealing ring seals the assembly gap between the plug-in portion and the core shaft.

[0020] Furthermore, the rotor shaft is provided with a chamfer at the opening of the connecting groove.

[0021] Furthermore, a bevel is provided on the contact surface between the large end of the mandrel and the pulling claw.

[0022] Further, in step S4, when the air tightness is qualified, a vacuum pump is connected to the airway, and then the vacuum pump is started, and the vacuum pump is turned on to suck a vacuum, and the tool is sucked by the vacuum pump and the suction cup.

[0023] The beneficial effects of a spindle with airtightness detection function and a method for detecting airtightness thereof disclosed in the present invention are as follows:

[0024] 1. When the first piston is driven to move toward the side close to the tool, the first piston can push the tool puller rod to move synchronously, and the tool puller rod drives the movable pad and the core shaft thereon to move synchronously, and the end face of the core shaft extends out of the rotor shaft to push the tool, thereby completing tool loosening or tool changing; in the tool loosening state, the tool and the pulling claw are connected, and the thrust of the first piston on the tool puller rod is released. The tool puller rod returns to its original position under the action of the reset spring, and then drives the core shaft to recover, thereby clamping the tool and completing tool pulling; after the tool is pulled, gas is injected into the airway, and the contact between the core shaft and the tool is judged by observing the change in the gas pressure value, thereby judging whether the pulling claw clamps the tool.

[0025] 2. By injecting gas into the airway and monitoring the changes in gas pressure in the airway in real time through the pressure switch, rapid detection of air tightness can be achieved, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a side view of the spindle broach state with airtight detection function disclosed by the present invention;

[0028] Figure 2 for Figure 1 AA line section view;

[0029] Figure 3 for Figure 2 A magnified view of part B in FIG.

[0030] Figure 4 It is a partial structural schematic diagram of the connection state of the spindle and the tool with airtight detection function disclosed in the present invention;

[0031] Figure 5 It is a side view of the spindle tool loosening state with airtight detection function disclosed by the present invention;

[0032] Figure 6 for Figure 5 The CC line section view in the figure;

[0033] Figure 7 for Figure 6 The enlarged view of the D part in FIG.

[0034] Figure 8 It is a side view of the main shaft with airtight detection function disclosed by the present invention in the airtight detection state;

[0035] Fig. 9 for Figure 8 EE line cross-sectional view.

[0036] In the figure: 1. body; 11. stator; 12. rotor; 121. connecting groove; 13. rotor shaft; 2. connecting seat; 3. oil cylinder; 31. first cylinder body; 311. first sealing chamber; 312. through hole; 32. first piston; 321. clearance groove; 4. cylinder; 41. second cylinder body; 411. guide hole; 42. second piston; 5. broaching device; 51. broaching rod; 511. air duct; 52. mandrel; 53. pulling claw; 54. reset spring; 55. movable pad; 6. knife disc; 61. slot; 7. sealing ring; 71. sealing ring; 81. guide belt; 82. sealing gasket; 9. piston rod; 91. air intake channel; 10. tool. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-9 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Combination Figure 1 and Figure 2 A spindle with airtight detection function includes a body 1, a connecting seat 2 is fixedly provided on the side of the body 1 away from the tool, and the connecting seat 2 and the body 1 are connected together by bolts. An oil cylinder 3 and an air cylinder 4 are fixedly provided on the end of the connecting seat 2 away from the body 1, and the oil cylinder 3 and the air cylinder 4 are coaxial, and the oil cylinder 3 is located between the air cylinder 4 and the connecting seat 2, and the oil cylinder 3 and the air cylinder 4 are fixedly connected, and the body 1, the connecting seat 2, the oil cylinder 3, and the cylinder 4 form a whole.

[0039] Combination Figure 2 and Figure 3 A stator 11, a rotor 12 and a rotor shaft 13 are arranged inside the machine body 1, wherein a broaching device 5 is arranged inside the rotor shaft 13, and the broaching device 5 includes a broaching rod 51, a core shaft 52, a broaching claw 53 for clamping a tool, a return spring 54 and a movable pad 55.

[0040] Combination Figure 3 and Figure 4 The end of the rotor shaft 13 away from the connection seat 2 is provided with a connection groove 121 in the radial direction thereof, the aperture of the connection groove 121 gradually decreases in the axial direction, and the rotor shaft 13 is provided with a chamfer at the larger opening end of the connection groove 121. The broaching rod 51 is coaxially arranged with the rotor shaft 13, and one end of the broaching rod 51 passes through the rotor shaft 13 and extends to the inside of the connection seat 2.

[0041] Combination Figure 3 and Figure 4 One end of the mandrel 52 is sleeved on the end of the broach rod 51, and the mandrel 52 and the broach rod 51 are connected together by threads. The end of the mandrel 52 away from the broach rod 51 is extended in the radial direction to have a large head end, and a bevel transition is provided between the large head end and the mandrel 52. Two sealing rings 71 are provided inside the large head end of the mandrel 52, and the two sealing rings 71 are arranged in a stepped manner along the axial direction of the mandrel 52, and the outer diameter of the sealing ring 71 close to the tool 10 is larger than the outer diameter of the other sealing ring 71, and the inner diameters of the two sealing rings 71 are equal.

[0042] Combination Figure 3 and Figure 4 The claw 53 adopts HSKA63 claw 53, and the claw 53 is sleeved on the outside of the core shaft 52. When the big end of the core shaft 52 contacts the claw 53, the big end of the core shaft 52 can drive the claw 53 to expand outward. At this time, the inclined surface is tangent to the outer wall of the claw 53.

[0043] Combination Figure 3 and Figure 4 One end of the claw 53 is fixedly connected to the inner wall of the rotor shaft 13, and the other end is a free end. A space for inserting the end of the tool 10 is formed between the free end of the claw 53 and the inner wall of the smaller opening end of the connecting groove 121 of the rotor shaft 13. When the tool 10 is inserted into the gap, the claw 53 and the mandrel 52 cooperate to clamp and fix the tool 10.

[0044] Reference Figure 2 There are two return springs 54, which are arranged side by side along the axis of the broaching rod 51, and the rotation directions of the two return springs 54 are opposite. The return spring 54 is a compression spring, which is sleeved on the middle part of the broaching rod 51, and the inner wall of the rotor shaft 13 is provided with a space for the return spring 54 to deform.

[0045] Reference Figure 2There are three movable pads 55, and the three movable pads 55 are all arranged inside the space. One of the movable pads 55 is located between the two reset springs 54, and the other two movable pads 55 are respectively arranged at both ends of the length direction of the space. The three movable pads 55 are all fixedly connected to the knife pulling rod 51. When the knife pulling rod 51 moves along its axial direction toward the side close to the tool 10, the knife pulling rod 51 can drive the movable pads 55 to squeeze the reset springs 54.

[0046] Reference Figure 2 The oil cylinder 3 is an oil cylinder, and the oil cylinder includes a first cylinder body 31 and a first piston 32. The first cylinder body 31 is provided with a first sealed cavity 311 with an opening on one side, and the aperture of the opening is smaller than the inner diameter of the first sealed cavity 311. The first sealed cavity 311 is connected to the connecting seat 2 through the opening. The first cylinder body 31 is provided with a filling hole, and the filling hole is arranged on one side close to the bottom wall of the first sealed cavity 311.

[0047] Reference Figure 2 The first piston 32, the broaching rod 51 and the mandrel 52 are all provided with mutually connected air passages 511. The first piston 32 has a T-shaped cross section, and a pressure chamber is formed between the end face of the first piston 32 and the bottom wall of the first sealing chamber 311. The filling hole connects the inside and outside of the pressure chamber, and pressure oil is injected into the pressure chamber through the filling hole. Under the action of the oil pressure, the first piston 32 can be pushed to move toward the side close to the tool 10. One end of the first piston 32 passes through the opening of the first sealing chamber 311 and extends to the inside of the connecting seat 2.

[0048] Combination Figure 2 and Figure 3 A cutting disc 6 is provided between the first piston 32 and the cutting rod 51. The cutting disc 6 is sleeved on the outside of the cutting rod 51 and is fixedly connected to the cutting rod 51. The cross section of the cutting disc 6 is a trapezoid. The lower bottom surface of the cutting disc 6 faces the first piston 32. A slot 61 is provided in the middle of the cutting disc 6 for the end of the first piston 32 to be inserted. The end of the cutting rod 51 extends to the inside of the slot 61. A clearance groove 321 is provided on the first piston 32 for the end of the cutting rod 51 to be inserted. When the end surface of the first piston 32 contacts the bottom wall of the slot 61, the air passage 511 of the first piston 32 is connected to the air passage 511 of the cutting rod 51, and the cutting rod 51 is inserted into the clearance groove 321. At this time, a space is reserved between the end of the cutting rod 51 and the bottom wall of the clearance groove 321, so as to facilitate the first piston 32 to tighten the cutting disc 6.

[0049] Combination Figure 2 and Figure 3 A sealing ring 7 is fixedly provided on the first piston 32. When the first piston 32 is inserted into the slot 61, the sealing ring 7 can seal the joint between the first piston 32 and the cutting disc 6, so that the gas in the detection airway 511 is not easy to leak from the joint, thereby improving the airtightness.

[0050] Combination Figure 5 , Figure 6 and Figure 7 The cylinder 4 is a cylinder, and the cylinder includes a second cylinder body 41 and a second piston 42. The second cylinder body 41 has the same structure as the first cylinder body 31, which will not be described in detail here. The bottom wall of the first sealed cavity 311 is provided with a through hole 312 connected to the opening of the second cylinder body 41, and the second cylinder body 41 and the first cylinder body 31 are connected through the through hole 312. The second piston 42 has the same structure as the first piston 32, which will not be described in detail here. When the cylinder is not injected with gas, the end face of the second piston 42 is flush with the bottom face of the first sealed cavity 311, so that the pressure oil injected into the first cylinder body 31 is not easy to enter the second cylinder body 41.

[0051] Combination Figure 6 and Figure 7 The second piston 42 and the first piston 32 are coaxially arranged. When the tool is pulled, there is no pressure oil in the cylinder, and the second piston 42 and the first piston 32 are abutted. At this time, gas is injected into the cylinder, and the second piston 42 can push the first piston 32 to move axially, so that the first piston 32 and the tool disc 6 are pressed tightly.

[0052] Combination Figure 6 and Figure 7 A guide belt 81 and a sealing gasket 82 are arranged between the second piston 42 and the inner wall of the second cylinder body 41. There are two sealing gaskets 82, and the two sealing gaskets 82 are respectively arranged on both sides of the guide belt 81, so that the liquid inside the first cylinder body 31 is not easy to enter the inside of the second cylinder body 41, thereby ensuring the airtightness of the first cylinder body 31 and the second cylinder body 41.

[0053] Combination Figure 6 and Figure 7 The first piston 32 is fixed with a piston rod 9 on the side facing the second piston 42. The second piston 42 is provided with a through hole for the piston rod 9 to pass through. The bottom wall of the second cylinder body 41 is provided with a guide hole 411. The piston rod 9 passes through the second piston 42 and is inserted into the guide hole 411. The second piston 42 and the piston rod 9 are slidably connected. Before the air tightness test, gas is injected into the cylinder. The gas pushes the second piston 42 to push the first piston 32 to move toward the cutting disc 6. The piston rod 9 can guide the movement of the second piston 42.

[0054] Combination Figure 6 and Figure 7The piston rod 9 is provided with an air intake passage 91 connected to the air passage 511, and the second cylinder body 41 is provided with a gas inlet connected to the air intake passage 91. When the end of the first piston 32 is inserted into the cutting disc 6, gas is introduced from the gas inlet, and the gas passes through the air intake passage 91 and the air passage 511 in sequence and enters between the core shaft 52 and the tool 10. By observing the change in the gas pressure value, it is judged whether the contact between the core shaft 52 and the tool 10 is tight, thereby judging whether the pulling claw 53 clamps the tool 10. When the pulling claw 53 clamps the tool 10, the gas pressure value is stable and does not change.

[0055] The implementation principle of the present application is as follows: when the tool 10 is not installed, the end of the first piston 32 is inserted into the inside of the cutting disc 6, and at this time, the air passage 511 of the first piston 32 is connected to the air passage 511 of the tool pull rod 51. When installing or replacing the tool 10, pressurized oil is injected into the oil cylinder, and the pressurized oil pushes the first piston 32 to move toward the side close to the tool 10. The first piston 32 can push the tool pull rod 51 to move synchronously, and the tool pull rod 51 drives the movable pad 55 and the mandrel 52 thereon to move synchronously, so that the end face of the mandrel 52 extends out of the rotor shaft 13. At this time, the reset spring 54 is in a compressed state, which is convenient for loosening or changing the tool, and reaches the state of loosening the tool (see Figure 6 );

[0056] In the tool release state, the tool 10 is connected to the pull claw 53, and the pressure oil in the oil cylinder is discharged. The pull rod 51 returns to its original position under the action of the reset spring 54, and then drives the mandrel 52 to return to its original position, so that the tool 10 is clamped. At this time, it is in the pull state (see Figure 2 ), at the same time, the end of the first piston 32 and the cutting disc 6 are separated.

[0057] In the broaching state, gas is introduced into the cylinder, and the gas pushes the second piston 42 to move, and the second piston 42 pushes the first piston 32 to move synchronously, so that the end of the first piston 32 is reinserted into the broaching disc 6, so that the first piston 32 and the broaching rod 51 are connected, and the airtight detection state is achieved (combined with Figure 8 and Fig. 9 ); gas is then introduced from the gas inlet, and the gas passes through the air inlet channel 91 and the air channel 511 in sequence and then enters between the core shaft 52 and the tool 10. By observing the change in the gas pressure value, it is judged whether the contact between the core shaft 52 and the tool 10 is tight, thereby judging whether the claw 53 clamps the tool 10. When the claw 53 clamps the tool 10, the gas pressure value is stable and unchanged.

[0058] Example 2

[0059] Based on the spindle with airtightness detection function in Example 1, a method for detecting the airtightness of the spindle in the broaching state includes the following steps:

[0060] S1: A mandrel 52 adapted to the HSKA63 claw 53 is manufactured according to the specifications, and a sealing ring is embedded in the interior of the large end of the mandrel 52. The inner diameters of the plurality of sealing rings are equal to the inner diameter of the mandrel 52, and the outer diameters of the plurality of sealing rings gradually decrease along the axial direction of the mandrel 52; a connecting groove 121 is provided at the end of the rotor shaft 13;

[0061] S2: Install the oil cylinder 3, the air cylinder 4 and the machine body 1 together, start the oil cylinder 3 to push the tool pull rod 51, push out the big end of the mandrel 52, then insert the end of the tool 10 into the connecting groove 121, drive the oil cylinder 3 in the reverse direction, and the tool pull rod 51 returns to its original position under the action of the return spring 54. At this time, the big end of the mandrel 52 can drive the claw 53 to expand outward so that the tool 10 is limited between the inner wall of the connecting groove 121 and the end of the claw 53;

[0062] S3: Connect the pipe joint, the pressure switch and the alarm to the airway 511. The pressure switch and the alarm are electrically connected;

[0063] S4: In the broaching state, 0.5Mpa air pressure is introduced into the air passage 511. If the pressure value detected by the pressure switch is less than 0.3Mpa within 10 minutes, the alarm will sound an alarm, and it can be determined that the air tightness of the connection between the spindle and the tool 10 is unqualified;

[0064] When the air tightness is qualified, the tool is replaced with a suction cup, and then a vacuum pump is connected to the airway 511, and then the vacuum pump is started and turned on to absorb vacuum, and the tool or other workpiece is moved under the action of the vacuum pump and the suction cup.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spindle with an airtightness detection function, comprising a body (1), wherein a stator (11), a rotor (12) and a rotor shaft (13) are arranged inside the body (1), characterized in that: An oil cylinder (3) and an air cylinder (4) are arranged on a side of the machine body (1) away from the tool, the oil cylinder (3) comprising a first cylinder body (31) and a first piston (32), the air cylinder (4) comprising a second cylinder body (41) and a second piston (42), and when oil is injected into the first cylinder body (31) or the second piston (42) is driven to move, the first piston (32) can move telescopically along its axial direction; A broaching device (5) is arranged inside the rotor shaft (13), and the broaching device (5) comprises a broaching rod (51), a core shaft (52), a broaching claw (53) for clamping the tool (10), a return spring (54), and a movable cushion block (55); the broaching claw (53) is a HSKA63 broaching claw (53); the first piston (32) and the broaching rod (51) are both provided with mutually communicating air passages (511); when the first piston (32) moves toward a side close to the tool, the first piston (32) can push the broaching rod (51) to move synchronously; A sealing ring (71) is fixedly provided at one end of the mandrel (52) close to the cutter, and the sealing rings (71) are multiple, and the multiple sealing rings (71) are arranged in a stepped manner along the axial direction of the mandrel (52); There are multiple return springs (54), and the rotation directions of the multiple return springs (54) are arranged alternately in positive and negative directions. When the return spring (54) is in a natural return state, the pull claw (53) clamps the tool (10); a piston rod (9) is fixedly provided on the first piston (32), and the second piston (42) is sleeved on the outside of the piston rod (9). An air inlet channel (91) connected to the airway (511) is provided on the piston rod (9); a knife disc (6) is fixedly provided on the knife rod (51), and a slot (61) is provided on the knife disc (6) for the end of the first piston (32) to be inserted, and the end of the knife rod (51) extends to the inside of the slot (61). A clearance groove (321) is provided on the first piston (32) for the end of the knife rod (51) to be inserted, and a sealing ring (7) is provided between the first piston (32) and the slot (61); a pipe joint, a pressure switch and an alarm are connected to the airway (511); When the first piston (32) is inserted into the slot (61), the broaching rod (51) is inserted into the clearance groove (321), and a space is reserved between the end of the broaching rod (51) and the bottom wall of the clearance groove (321); When the first piston (32) is driven by pressure oil to move toward the side close to the tool, the end of the first piston is inserted into the slot of the cutting disc, and the first piston pushes the tool pulling rod to move toward the side close to the tool to push the pulling claw to open so as to grasp or release the tool; When the first piston is driven by the second piston to move toward the side close to the tool, the end of the first piston is inserted into the slot of the cutting disc, the air inlet channel and the air duct are connected, and 0.5Mpa gas is introduced from the gas inlet. If the pressure switch detects a pressure value less than 0.3Mpa within 10 minutes, the alarm will sound an alarm.

2. A method for detecting the air tightness of the spindle in the broaching state based on the spindle with air tightness detection function according to claim 1, characterized in that: The steps include: S1: A mandrel (52) adapted to the HSKA63 pull claw (53) is manufactured according to the specifications, one end of the mandrel (52) is set as a large head end, a sealing ring (71) is embedded in the large head end of the mandrel (52), and the outer diameters of the plurality of sealing rings (71) are gradually reduced along the axial direction of the mandrel (52); A connecting groove (121) is provided at the end of the rotor shaft (13), and the hole diameter of the connecting groove (121) gradually decreases along the axial direction; S2: The oil cylinder (3), the air cylinder (4) and the machine body (1) are assembled together, the oil cylinder (3) is started to push the tool pull rod (51), the large end of the core shaft (52) is pushed out, and then the end of the tool is inserted into the connection groove (121), and the oil cylinder (3) is driven in the reverse direction. The tool pull rod (51) returns to its original position under the action of the return spring (54), and at this time, the large end of the core shaft (52) can drive the pull claw (53) to expand outward so that the tool is limited between the inner wall of the connection groove (121) and the end of the pull claw (53); S3: Install a connecting pipe joint, a pressure switch and an alarm on the airway (511), and the pressure switch and the alarm are electrically connected; S4: In the broaching state, 0.5Mpa air pressure is introduced into the airway (511). If the pressure value detected by the pressure switch is less than 0.3Mpa within 10 minutes, the alarm will sound an alarm, indicating that the air tightness of the connection between the spindle and the tool is unqualified.

3. A method for detecting the air tightness of a spindle in a broaching state according to claim 2, characterized in that: An inserting portion extends from the end of the cutter (10), and the inserting portion is inserted into the interior of the large end of the core shaft (52). The stepped sealing ring (71) seals the assembly gap between the inserting portion and the core shaft (52).

4. A method for detecting the air tightness of a spindle in a broaching state according to claim 2, characterized in that: The rotor shaft (13) is provided with a chamfer at the opening of the connecting groove (121).

5. A method for detecting the air tightness of a spindle in a broaching state according to claim 2, characterized in that: The contact surface between the large end of the core shaft (52) and the pulling claw (53) is provided with an inclined surface.

6. A method for detecting the air tightness of a spindle in a broaching state according to claim 2, characterized in that: In step S4, when the air tightness is qualified, the tool is replaced with a suction cup, and then a vacuum pump is connected to the airway (511), and then the vacuum pump is started, and the vacuum pump is turned on to suck a vacuum, and the tool is sucked by the vacuum pump and the suction cup.

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